Condensing-engine.



J. STUMPF.

CONDENSING ENGINE.

APPLIOATION FILED 33.15, 1910.

Patented May 23, 1911 m'i'nemm JOHANN STUMR 0F 3353313116,

northeastern-enema.

Specification or" Latte e Patented l Application filed February 15, 193.6. {la-$5321.

To all whom it may concern:

Be it known that I, JOHANN Srurrrr a subject of the King of Prussia, German Emperor, and resident of 33 Kurfiirstendamm, Berlin, in the German Empire, have invented certain new and useful Improvements .Relating to Condensing-Engines, oi which the following is a specification.

This invention relates to condensing engines of the type in which the exhaust is controlled by the piston covering and uncovering ports in the cylinder wall at the end of its stroke.

This invention relates to condensing steam engines of the uni-directional flow type that is. engines in which steam is admitted at one end of the cylinder and is exhausted through ports uncovered by the piston at the end of its travel. The steam in passing from the inlet to the exhaust does not return on its path and hence the name uni-directional flow steam engine.

In my co-pending application Ser. No. 511,126, I have described a uni-directional flow steam engine in which there is a heating jacket on the cylinder disposed about the inlet end, an unjacketed part nearer the oxhaust and a cooling jacket about the exhaust ports. With this arrangement the cylinder itself near the exhaust ports exerts a cer tain condensing action on the steam layers near these ports. This condensing action facilitates the exhaust of the steam from the cylinder which must be very efiicient in unidirectional fiow engines if the clearance space is to be retained within the reasonable limits necessary for efficiency.

According to the present invention this eifective exhaust of the steam from the cylinder in the short period for which the ports are opened is effected by arranging the con-- densing chamber about the cylinder and communicating directly therewith through the wide exhaust ports usual in uni-di'rcctional flow engines. In this way not only is the cooling action about the exhaust ports increased but there is no intermission in the condensation such as ,would occur if the by way of condenser the conrhensc I inder n... r ,ust ports and tnis is rendered racti means of the scavenging action described in my co-pending application 4127,7621

Referring to the drawings which illustrate form of this invention ample, Figure l is a longitudinal section Fig. 2 is a cross section of one practi tlOlG construction of uni-directionai flow condensing engine.

Steam enters the cyiinder a: from a hollow cover a through the inlet I), the working steam heing supplied to the cover by the inlet of. This steam is out off and expands therebypropelling the piston f forward (or backward) until at and near the end of its stroke the piston uncovers the ring of wide portsc. The steam never returns on its path from the inlet to the exhaust 0, hence the term uni directional flow. The exhaust ports a being arranged all around the cylinder form a very wide exhaust passage and those ports comn' unicate directly through the cylinder walls with the condenser chamber (Z which is arranged as an annulus around the cylinder in the immediate neighborhood of the exhaust ports 0. To the lower flanged part. (Z of the chamber (Z there is fixed the box (Z in which, in the form shown the spraying pipe 6 of a spray condenser is arranged. The flow of steam through the ports 0 is facilitated by rounding oii the corners of said ports as shown.

By means of this invention the suction action through the ports 0 is sufiicient to exhaust the cylinder to a high degree even in thevery short period avaiiable for this operation in high speed of the unidir ctional flow pe.

v rat 1 c5 l. in a st n engine, the combination with a cylinder having an inlet port at one end, exhaust ports at some distance from that end, and n external ci 'cumierential chamber covering said exhaust ports, of a piston short distance from i means invention .rts witiin the working cyl- .nal circumferential chamber covering the Witnesses:

controlling said exhaust ports as it reciprofor supplying a cooling agent in said cates, and means for cooling said chamber. chamber.

2. In asteam engine, the combination with In Witness whereof I have hereunto set a cylinder having an inlet portat each end, niyhand in the presence of two witnesses. exhaust ports near its middle, and an exter- J OHANN STUMPF.

exhaust'ports, of a piston controlling the ex- FERDINAND RIESE, haust ports as it reciprocates, and means "VOLDEMAR HAUPT. 

